package fun.sssdnsy.config.properties;

import fun.sssdnsy.annotation.Anonymous;
import org.apache.commons.lang3.RegExUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.regex.Pattern;

/**
 * 设置Anonymous注解允许匿名访问的url
 *
 * @author sssdnsy
 */
@Configuration
public class PermitAllUrlProperties implements InitializingBean, ApplicationContextAware {
    private static final Pattern            PATTERN  = Pattern.compile("\\{(.*?)\\}");
    public               String             ASTERISK = "*";
    private              ApplicationContext applicationContext;
    private              List<String>       urls     = new ArrayList<>();

    @Override
    public void afterPropertiesSet() {
        RequestMappingHandlerMapping           mapping = applicationContext.getBean("requestMappingHandlerMapping", RequestMappingHandlerMapping.class);
        Map<RequestMappingInfo, HandlerMethod> map     = mapping.getHandlerMethods();

        map.keySet().forEach(info -> {
            HandlerMethod handlerMethod = map.get(info);

            // 获取方法上边的注解 替代path variable 为 *
            Anonymous method = AnnotationUtils.findAnnotation(handlerMethod.getMethod(), Anonymous.class);
            Optional.ofNullable(method)
                    .ifPresent(anonymous ->
                            Optional.ofNullable(info.getPatternsCondition())
                                    .ifPresent(anon -> anon.getPatterns()
                                            .forEach(url -> urls.add(RegExUtils.replaceAll(url, PATTERN, ASTERISK)))));

            // 获取类上边的注解, 替代path variable 为 *
            Anonymous controller = AnnotationUtils.findAnnotation(handlerMethod.getBeanType(), Anonymous.class);
            Optional.ofNullable(controller).ifPresent(anonymous ->
                    Optional.ofNullable(info.getPatternsCondition())
                            .ifPresent(anon -> anon.getPatterns()
                                    .forEach(url -> urls.add(RegExUtils.replaceAll(url, PATTERN, ASTERISK)))));
        });
    }

    @Override
    public void setApplicationContext(ApplicationContext context) throws BeansException {
        this.applicationContext = context;
    }

    public List<String> getUrls() {
        return urls;
    }

    public void setUrls(List<String> urls) {
        this.urls = urls;
    }
}
